US3143064A - Print hammer anti-rebound mechanism - Google Patents

Print hammer anti-rebound mechanism Download PDF

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Publication number
US3143064A
US3143064A US229907A US22990762A US3143064A US 3143064 A US3143064 A US 3143064A US 229907 A US229907 A US 229907A US 22990762 A US22990762 A US 22990762A US 3143064 A US3143064 A US 3143064A
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US
United States
Prior art keywords
hammer
print hammer
pawl
print
printing stroke
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US229907A
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English (en)
Inventor
Courtney H Vann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NCR Voyix Corp
National Cash Register Co
Original Assignee
NCR Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NCR Corp filed Critical NCR Corp
Priority to US229907A priority Critical patent/US3143064A/en
Priority to GB33204/63A priority patent/GB968496A/en
Priority to CH1247563A priority patent/CH417179A/fr
Priority to DE19631449502 priority patent/DE1449502A1/de
Application granted granted Critical
Publication of US3143064A publication Critical patent/US3143064A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J9/00—Hammer-impression mechanisms
    • B41J9/42—Hammer-impression mechanisms with anti-rebound arrangements

Definitions

  • the invention relates to an improved anti-rebound mechanism adapted to spring-actuated impression or print hammers of the kind used in machines of the type shown and described in United States Letters Patent No. 2,666,- 574, issued to Carl H. Carlson et al., on January 19, 1954.
  • the print hammer is actuated by a powerful spring, which when released, forces the hammer against a type carrier with a sudden blow.
  • a powerful spring which when released, forces the hammer against a type carrier with a sudden blow.
  • the driving spring which tends to cause such hammer to rebound, and in some instances, this rebound is of sufficient magnitude to cause a second or ghost impression to be made.
  • a single latch pawl is operably associated in such a way with a spring-actuated print hammer that any possible rebound thereof is positively prevented after each printing stroke, thereby avoiding blurred impressions caused by an overprinting due to the hammer striking the type carrier the second time.
  • the principal object of this invention is to provide an extremely simple, yet very effective mechanism to prevent rebound of spring-actuated print hammers.
  • a further object of the invention is to provide such a mechanism which, without the use of any great number of tools and the like, may be quickly and easily adapted to printer constructions employing either print hammers or printing platens of the spring-actuated type.
  • Still a further object of the instant invention is to provide such a mechanism of extremely low cost, both in its manufacture and in its assembly both to new and inservice machines.
  • the invention includes certain novel features of construction and combinations of parts, the essential elements of which are set forth in appended claims and a preferred form or embodiment of which is hereinafter described with reference to the drawing which accompanies and forms a part of this specification.
  • FIG. 1 is a side elevation of a printer unit of the spring-actuated hammer type embodying the instant invention, the hammer being illustrated therein in the position which it assumes just before being released for a printing stroke;
  • FIG. 2 is a detail side view of the print harruner of FIG.
  • FIG. 3 is a detail side view of the print hammer of FIG. 1 as associated with the instant invention immediately after the completion of a printing stroke.
  • the lower end portion of such type bar 13 is pivoted to a machine carried differential mechanism (not illustrated herein) so that the digit value being entered into the machine may be represented by a particular type member 17 being moved to a printing position with respect to the paper platen 16.
  • the actual printing operation is then performed as such type member 17 is struck by its associated print hammer 10 (as illustrated in FIG. 2) when released from a cocked position (as illustrated in FIG. 1) at a precise printing time determined by the tripping of a hammer latch 18 during machine operation.
  • a stud 19 thereon enables an interponent 29 to rock counter-clockwise on a bail 21 under urge of a spring 22.
  • the bail 21 extends between an operating arm 23 and another operating arm, like the arm 23, secured on the outer ends of the print hammer support shaft 11, extending between the printer side frames 12.
  • a machine of the type herein referred to Operation of a machine of the type herein referred to is through suitable rocking of a machine rear drive shaft 24, such as by means of an electric motor or operating handle, which shaft 24 is caused to oscillate first counterclockwise and then clockwise back to its home position (FIG. 1).
  • a cam lever 25, secured on such rear drive shaft 24, is also rocked first counter-clockwise and then clockwise during a machine operation.
  • a stud 26 thereon strikes a tail portion 23a of the operating arm 23, shifting the bail 21 and the previously rocked interponent 20 toward a lower step 18a of the hammer latch 18, which thereby is moved clockwise near mid-cycle of a machine operation.
  • FIG. 1 As best understood from FIG.
  • each of the printer side frames 12 is supported both by the previously-described machine rear drive shaft 24 and by a second shaft 31 fixedly extending laterally across the machine.
  • a spring 35 stretched between such pawl arm portion 33 and an appropriate hanger 36 carried by a further shaft 37 extending laterally across the machine, yieldingly urges the pawl 32 counter-clockwise that extent permitted by the upper surface of the pawl tail portion 34 coming into engagement with the under surface of a square stud 38 carried by the print hammer 10.
  • the pawl tail portion 34 is arcuately shaped and has the inner end portion of its upper surface, designated as 34a, developed on a common radius which, until the square stud 38 is caused to leave same during each printing stroke of the hammer 10, maintains the pawl 32 in what may be called an ineffective position with respect to stopping the hammer 10 from striking an aligned type member 17. That is, as best understood from FIG. 1, the normal positioning of the anti-rebound pawl 32 by the print hammer carried square stud 38, when such print hammer is in its cocked position, is maintained by surface 34a throughout the major portion of each printing stroke made by the hammer.
  • the outer end of such pawl tail portion 34 being of a length slightly greater than that of the square stud 38, is provided with an upper surface 34b defined by a lesser radius than that of the inner surface 34a, which surface 3415 would,
  • pawl tail surfaces 34a and 34b is a recessed zone 34c of the pawl tail portion 34, being again of a length greater than that of the square stud 38, being squared at that end thereof merging into the surface 34b, and being inclined at that end thereof merging into the surface 34a.
  • the overall effect of such configuration of the pawl 32 is that of a hook member having a major length (34a) of one radius, a minor length (34b) of a lesser radius, and an undercut or recess (34c) therebetween with one square wall and one sloping Wall.
  • the jumping-over of the pawl recess 340 by the square stud 38 during each printing stroke of the hammer 10 is the result of the combined variations both in the weights of the springs 30 and 35 and in the planes of the pawl surfaces 34a and 3412.
  • said printing stroke imparting means comprises a spring for impelling the print hammer against said type carrier; said latching surface defines one wall portion of a latch member carried recess; said control surface comprises a first surface portion extending to said recess and a second surface portion extending therebeyond; means for urging both said control surface and said recess toward engagement with said hammer abutment; said control surface first surface portion normally engaging said hammer abutment; and said hammer impelling spring is of a magnitude suflicient to transfer the hammer abutment along said control surface first surface portion, across said recess, and onto said control surface second surface portion during each printing stroke of the print hammer, after which printing stroke the magnitude of said spring decreases to an extent which permits the said recess to engage the hammer abutment during any print hammer rebound from the type carrier.
  • control surface second surface portion is in a plane varying from the plane of the control surface first surface portion.
  • said printing stroke imparting means comprises a strong spring for impelling said print hammer against said type carrier; and a further spring of lesser strength continually urges said pawl member in a direction for maintaining one or the other of the control and latching surfaces thereof in engagement with the print hammer projection.

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  • Impact Printers (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
US229907A 1962-10-11 1962-10-11 Print hammer anti-rebound mechanism Expired - Lifetime US3143064A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US229907A US3143064A (en) 1962-10-11 1962-10-11 Print hammer anti-rebound mechanism
GB33204/63A GB968496A (en) 1962-10-11 1963-08-22 Anti-rebound device for a printing hammer
CH1247563A CH417179A (fr) 1962-10-11 1963-10-09 Mécanisme imprimeur de caractères muni d'un dispositif anti-rebond
DE19631449502 DE1449502A1 (de) 1962-10-11 1963-10-09 Antirueckprallvorrichtung fuer Druckhaemmer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US229907A US3143064A (en) 1962-10-11 1962-10-11 Print hammer anti-rebound mechanism

Publications (1)

Publication Number Publication Date
US3143064A true US3143064A (en) 1964-08-04

Family

ID=22863161

Family Applications (1)

Application Number Title Priority Date Filing Date
US229907A Expired - Lifetime US3143064A (en) 1962-10-11 1962-10-11 Print hammer anti-rebound mechanism

Country Status (4)

Country Link
US (1) US3143064A (fr)
CH (1) CH417179A (fr)
DE (1) DE1449502A1 (fr)
GB (1) GB968496A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3495529A (en) * 1968-03-07 1970-02-17 Ncr Co Type bar anti-rebound mechanism
US4037532A (en) * 1976-03-08 1977-07-26 Xerox Corporation Hammer assembly
US4444107A (en) * 1981-02-16 1984-04-24 Esselte Pendaflex Corporation Portable labeling machine
US4867832A (en) * 1987-03-02 1989-09-19 Werner Becker Portable labeling machine

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1613129A (en) * 1927-01-04 A corpxs o
US1652057A (en) * 1927-12-06 shipley
US1747743A (en) * 1923-10-25 1930-02-18 Sundstrand Corp Printing mechanism
US2066784A (en) * 1934-12-22 1937-01-05 Ibm Printing mechanism
US2117451A (en) * 1938-05-17 robertson
US2204187A (en) * 1940-06-11 Time recorder
US2342082A (en) * 1944-02-15 Cash register

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1613129A (en) * 1927-01-04 A corpxs o
US1652057A (en) * 1927-12-06 shipley
US2117451A (en) * 1938-05-17 robertson
US2204187A (en) * 1940-06-11 Time recorder
US2342082A (en) * 1944-02-15 Cash register
US1747743A (en) * 1923-10-25 1930-02-18 Sundstrand Corp Printing mechanism
US2066784A (en) * 1934-12-22 1937-01-05 Ibm Printing mechanism

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3495529A (en) * 1968-03-07 1970-02-17 Ncr Co Type bar anti-rebound mechanism
US4037532A (en) * 1976-03-08 1977-07-26 Xerox Corporation Hammer assembly
US4444107A (en) * 1981-02-16 1984-04-24 Esselte Pendaflex Corporation Portable labeling machine
US4867832A (en) * 1987-03-02 1989-09-19 Werner Becker Portable labeling machine

Also Published As

Publication number Publication date
DE1449502A1 (de) 1969-05-14
CH417179A (fr) 1966-07-15
GB968496A (en) 1964-09-02

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